diff options
Diffstat (limited to 'src/ssl/pqueue/pqueue.c')
-rw-r--r-- | src/ssl/pqueue/pqueue.c | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/src/ssl/pqueue/pqueue.c b/src/ssl/pqueue/pqueue.c new file mode 100644 index 0000000..ecaa139 --- /dev/null +++ b/src/ssl/pqueue/pqueue.c @@ -0,0 +1,194 @@ +/* + * DTLS implementation written by Nagendra Modadugu + * (nagendra@cs.stanford.edu) for the OpenSSL project 2005. + */ +/* ==================================================================== + * Copyright (c) 1999-2005 The OpenSSL Project. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * 3. All advertising materials mentioning features or use of this + * software must display the following acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" + * + * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to + * endorse or promote products derived from this software without + * prior written permission. For written permission, please contact + * openssl-core@OpenSSL.org. + * + * 5. Products derived from this software may not be called "OpenSSL" + * nor may "OpenSSL" appear in their names without prior written + * permission of the OpenSSL Project. + * + * 6. Redistributions of any form whatsoever must retain the following + * acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" + * + * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY + * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR + * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + * ==================================================================== + * + * This product includes cryptographic software written by Eric Young + * (eay@cryptsoft.com). This product includes software written by Tim + * Hudson (tjh@cryptsoft.com). */ + +#include <openssl/pqueue.h> + +#include <string.h> + +#include <openssl/mem.h> + + +typedef struct _pqueue { + pitem *items; + unsigned count; +} pqueue_s; + + +pitem *pitem_new(uint8_t prio64be[8], void *data) { + pitem *item = (pitem *)OPENSSL_malloc(sizeof(pitem)); + if (item == NULL) { + return NULL; + } + + memcpy(item->priority, prio64be, sizeof(item->priority)); + + item->data = data; + item->next = NULL; + + return item; +} + +void pitem_free(pitem *item) { + if (item == NULL) { + return; + } + + OPENSSL_free(item); +} + +pqueue pqueue_new(void) { + pqueue_s *pq = (pqueue_s *)OPENSSL_malloc(sizeof(pqueue_s)); + if (pq == NULL) { + return NULL; + } + + memset(pq, 0, sizeof(pqueue_s)); + return pq; +} + +void pqueue_free(pqueue_s *pq) { + if (pq == NULL) { + return; + } + + OPENSSL_free(pq); +} + +pitem *pqueue_peek(pqueue_s *pq) { return pq->items; } + +pitem *pqueue_find(pqueue_s *pq, uint8_t *prio64be) { + pitem *curr; + + for (curr = pq->items; curr; curr = curr->next) { + if (memcmp(curr->priority, prio64be, sizeof(curr->priority)) == 0) { + return curr; + } + } + + return NULL; +} + +size_t pqueue_size(pqueue_s *pq) { + pitem *item = pq->items; + size_t count = 0; + + while (item != NULL) { + count++; + item = item->next; + } + return count; +} + +piterator pqueue_iterator(pqueue_s *pq) { return pq->items; } + +pitem *pqueue_next(piterator *item) { + pitem *ret; + + if (item == NULL || *item == NULL) { + return NULL; + } + + ret = *item; + *item = (*item)->next; + + return ret; +} + +pitem *pqueue_insert(pqueue_s *pq, pitem *item) { + pitem *curr, *next; + + if (pq->items == NULL) { + pq->items = item; + return item; + } + + for (curr = NULL, next = pq->items; next != NULL; + curr = next, next = next->next) { + /* we can compare 64-bit value in big-endian encoding with memcmp. */ + int cmp = memcmp(next->priority, item->priority, sizeof(item->priority)); + if (cmp > 0) { + /* next > item */ + item->next = next; + + if (curr == NULL) { + pq->items = item; + } else { + curr->next = item; + } + + return item; + } else if (cmp == 0) { + /* duplicates not allowed */ + return NULL; + } + } + + item->next = NULL; + curr->next = item; + + return item; +} + + +pitem *pqueue_pop(pqueue_s *pq) { + pitem *item = pq->items; + + if (pq->items != NULL) { + pq->items = pq->items->next; + } + + return item; +} |